/*字体样式*/
.my_font{
    font-style: italic ;
    font-weight: bolder;
    font-size:2.75em;
    font-family:华文中宋, Serif;
    line-height: 5rem;/*5px*16=80px*/
    /*!*line-height: 5em;*//*5*font-size(2.75em)=5*2.75*16px=220px*/
}
/*文本样式*/
.my_text{
    border: 1px solid black;
    width: 30rem ;
    height: 10rem;
    letter-spacing: 1rem;
    line-height: 2rem;
    text-indent: 1rem ;
    text-align: center ;
    vertical-align: middle;
}
/*颜色样式*/
.my_color{
    border: 1px solid black;
    width: 30rem ;
    height: 10rem;
    color: blue;
}
/*背景样式*/
.my_bg{
    border: 1px solid black;
    width: 50rem ;
    height: 20rem;
    background: #c82333 url("https://www.baidu.com/img/bd_logo1.png")no-repeat  ;
}
/*列表样式*/
.my_list{
    list-style-type: none;
    list-style-image: url("http://www.jju.edu.cn/images/ico1.gif") ;
}
/*盒子模型*/
.my_box{
    border: 1px solid black;
    width: 50rem ;
    height: 20rem;
    margin: 1rem  1rem ;
    padding: 1rem ;
}